i965/vec4: Add constructor of src_reg from a fixed hardware reg.

Reviewed-by: Paul Berry <stereotype441@gmail.com>

src/mesa/drivers/dri/i965/brw_vec4.cpp

@@ -112,6 +112,14 @@ src_reg::src_reg(int32_t i)
    this->imm.i = i;
 }
 
+src_reg::src_reg(struct brw_reg reg)
+{
+   init();
+
+   this->file = HW_REG;
+   this->fixed_hw_reg = reg;
+}
+
 src_reg::src_reg(dst_reg reg)
 {
    init();

src/mesa/drivers/dri/i965/brw_vec4.h

@@ -126,6 +126,7 @@ public:
    src_reg(float f);
    src_reg(uint32_t u);
    src_reg(int32_t i);
+   src_reg(struct brw_reg reg);
 
    bool equals(src_reg *r);
    bool is_zero() const;